The Government Cable Office in Seward, Alaska, United States, is a historic building that served as a telegraph office that connected Seward with communications in the rest of the United States. The cable office was constructed in 1905 by the U.S. Army Signal Corps as part of the Washington–Alaska Military Cable and Telegraph System (WAMCATS). Telegraph service from the lower states first connected to Valdez, Alaska. In summer 1905, submarine cable was extended from Valdez to Seward. The building was listed on the National Register of Historic Places in 1980.